The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

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Solution

(i) Eka-boron was named Scandium (Sc).

(ii) Eka-aluminium was named Gallium (Ga).

(iii) Eka- silicon was named Germanium (Ge).

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Q. Gallium and germanium (discovered later) were placed below aluminium and silicon in their respective groups. The names given by Mendeleev for Gallium and Germanium are Eka-aluminium and Eka-silicon. Similarly, the gap that he has left for the undiscovered element that comes after aluminium is given the name Eka-aluminium.

Q. The element "Eka-aluminium" predicted by Mendeleev was later discovered as

Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

(a) Name the element which has taken the place of (i) eka-aluminium and (ii) eka-silicon

(b) Mention the period/periods of these elements in the modern periodic table.

(d) Classify these elements as metals, non-metals or metalloids.

(e) How many valence electrons are present in the atoms of each of these elements?

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-Silicon and Eka-Aluminium.
Name the elements which have taken the place of these elements

Q. Assertion :According to Mendeleev, the properties of elements are a periodic function of their atomic weights. Reason: Mendeleev left the gap under aluminium and a gap under silicon, and called these elements Eka-Aluminium and Eka-Silicon.

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The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

(i) Eka-boron was named Scandium (Sc). (ii) Eka-aluminium was named Gallium (Ga). (iii) Eka- silicon was named Germanium (Ge).

(i) Eka-boron was named Scandium (Sc).

(ii) Eka-aluminium was named Gallium (Ga).

(iii) Eka- silicon was named Germanium (Ge).